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石膏的种类很多,但用于制作立体模型的石膏主要是α—半水石膏与β—半水石膏。β—半水石膏以材料低廉、来源广泛、技术成熟而被广泛运用,也早已为刑事技术部门在侦破案件中采用。但对于α—半水石膏,很多从事现场勘查的同志却不大熟悉。 一、α—半水石膏的特点及与β—半水石膏的区别。 常用的β—半水石膏是普通模型石膏的主要部分,而α—半水石膏是高强模型石膏的主要成分。α型与β型半水石膏虽然在微观结构上相似,但其宏观特性却相差很大。概括起来,它们的差别主要有以下几点: 1、在结晶形态上的差别。用扫描电镜观察表明,α型半水石膏是致密的、完整的、粗
Many types of gypsum, but for the production of three-dimensional model of gypsum is mainly α-hemihydrate and β-hemihydrate. β-hemihydrate gypsum is widely used in the fields of cheap materials, wide range of sources and mature technology. It has also been adopted by criminal technology departments in detecting cases. However, for α-hemihydrate gypsum, many comrades engaged in on-site exploration are not very familiar with it. First, the characteristics of α-hemihydrate gypsum and the difference between β-hemihydrate gypsum. Common β-hemihydrate gypsum is the main part of common model gypsum, and α-hemihydrate gypsum is the main component of high-strength model gypsum. Although α-type and β-type hemihydrate gypsum are similar in microstructure, their macroscopic properties are quite different. To sum up, their differences are mainly the following points: 1, the crystal form of the difference. Scanning electron microscopy showed that α-hemihydrate gypsum was dense, complete and coarse